Estimating the background air concentration excluding the contribution of an individual source

This paper presents two simple methods for the estimation of the instantane ous background air pollution level in a study area around an emitting point source. The methods allow estimation of concentrations non-inclusive of th e contribution of the local emitting source. Hourly records of several moni toring stations located around the point source and results of the diagnost ic Lagrangian particle dispersion model LADISMO are used in the calculation s. A hypothetical case study is used to demonstrate the application of the two methods.